Shop for Heating, Venting & Cooling at The Home Depot. The LASKO 20 in. 3-Speed Box Fan combines the cooling power of 3 fan speeds with the wide-area air flow of 2,500 CFM air circulation and a 20 in. fan diameter, all in a compact, lightweight, energy-efficient design. The 6 ft. cord and slip-resistant feet allow flexible placement without fan slippage and the built-in carry handle makes it easy to transport the fan between rooms. The plastic material provides reliable strength and durability.